I've just sent another dev release off to CPAN, 0.13_03 to test the recent Build changes that were necessary to get AMD64 boxen to correctly compile. It turns out that they really need the "-fPIC" flag at compilation and link time or else stuff blows up:

usr/bin/ld: BLAS_wrap.o: relocation R_X86_64_32S against `a local symbol' can not be used when making a shared object; recompile with -fPIC BLAS_wrap.o: could not read symbols: Bad valuecollect2: ld returned 1 exit statuserror building blib/arch/auto/Math/GSL/BLAS/BLAS.so file from 'BLAS_wrap.o' at inc/GSLBuilder.pm line 99.